Cambridge IGCSE Physics 0625 — 2005 May/June Paper 5 · Variant 1

This document consists of 7 printed pages, 1 blank page and an inserted Answer Booklet. SPA MML 8430 4/04 S81480/4 © UCLES 2005 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/05 Paper 5 Practical Test May/June 2005 1 hour 15 minutes Additional Materials: As specified in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Follow the instructions on the front cover of the Answer Booklet. Write your answers in the spaces provided in the Answer Booklet. Answer all questions. You are expected to record all your observations as soon as these observations are made. An account of the method of carrying out the experiments is not required. At the end of the examination, hand in only the Answer Booklet. www.XtremePapers.com

1 In this experiment you are to investigate the change in temperature of hot water as cold water is added. Record all your observations on pages 2 and 3 of your Answer Booklet. Carry out the following instructions, referring to Fig. 1.1. Fig. 1.1 (a) You are provided with 100 cm3 of hot water (labelled A) and a supply of cold water. The cold water is approximately at room temperature. (i) Measure and record the temperature of the cold water. (ii) Measure and record in the first row of the table the temperature
of the hot water. (iii) Pour 20 cm3 of the cold water into the measuring cylinder. Transfer this water to the beaker containing the hot water. Measure and record the temperature
of the mixture of hot and cold water. Record the total volume V of cold water that you have added. (iv) Repeat step (iii) four times until you have added a total of 100 cm3 of cold water. (v) Complete the column headings in the table. (vi) Use the data in the table to plot a graph of
(y-axis) against V (x-axis). Draw the best-fit curve. thermometer water 2 0625/05/M/J/05 © UCLES 2005 © UCLES 2005

(b) A student carrying out this experiment obtained the graph shown in Fig. 1.2. Fig. 1.2 The theoretical line shows the results expected by the student after calculating the values of
. The student assumed that all the heat lost by the hot water was gained by the cold water when the cold water was poured into the beaker. The other line shows the student’s experimental results. The student had carried out the experiment with care. Suggest a practical reason why the experimental graph line differs from the theoretical line. 100 80 60 40 20 0 30 40 50 60 70 80 V / cm3
/ °C theoretical line experimental line 3 0625/05/M/J/05 [Turn over © UCLES 2005 © UCLES 2005

2 In this experiment you are to investigate the resistance of resistance wire in different circuit arrangements. Record all your observations and readings on page 4 of your Answer Booklet. The circuit shown in Fig. 2.1 has been set up for you. Fig. 2.1 (a) Switch on. Measure and record in the table the current I in the circuit and the p.d. V across the section of resistance wire AB. Switch off. (b) Record the length l of the resistance wire AB. (c) Calculate the resistance R of the section of wire AB using the equation R = . Record this value of R in the table. (d) Complete the column headings for each of the l, I, V and R columns of the table. (e) Repeat steps (a) – (c) with the voltmeter connected across section AC of the resistance wire. (f) Repeat steps (a) – (c) with the voltmeter connected across section AD of the resistance wire. (g) Use your results to predict the resistance of a 1.50 m length of the same wire. Show your working. V ––I A B C D power source metre rule A V 4 0625/05/M/J/05 © UCLES 2005 © UCLES 2005

3 In this experiment you are to investigate the period of oscillation of a mass attached between two springs. Record all your observations on page 5 of your Answer Booklet. Carry out the following instructions, referring to Fig. 3.1. The apparatus has been set up for you. Fig. 3.1 You are provided with a mass m of 400 g attached between two springs. (a) Displace the mass a small distance downwards and release it so that it oscillates. Record the time t1 taken for 10 complete oscillations of the mass. Also record the time t2 taken for another 10 complete oscillations of the mass. (b) Calculate t, the average value of t1 and t2. (c) Calculate the period T of the oscillations. T is the time for one complete oscillation. (d) Calculate the value of T — m (e) Repeat steps (a) – (d) using values for m of 300 g and 200 g. (f) Complete the final column heading in the table. (g) A student suggests that T should be directly proportional to m. State with a reason whether or not your results support this suggestion. (h) In the experiment you have just done, the mass oscillates rapidly so that it is difficult to take the times accurately. The instructions in the question included methods of improving the accuracy of the value obtained for the period T. Describe briefly one of these methods and any calculation involved to obtain the T value. stand clamp spring mass mass spring clamp one complete oscillation 5 0625/05/M/J/05 [Turn over © UCLES 2005 © UCLES 2005 .

4 In this experiment you will investigate the refraction of light through a transparent block. Record all your observations and answers on page 7 of your Answer Booklet. You are supplied with three ray trace sheets. Carry out the following instructions, referring to Figs. 4.1, 4.2 and 4.3. Fig. 4.1 (a) Place the transparent block with its largest face down on one of the ray trace sheets as shown in Fig. 4.1. One of the longest sides is to be along line PQ. (b) Draw round the block and label the corners A, B, C and D. Remove the block. (c) Place the ray trace sheet on the pin board and push a pin X into the paper on line EF close to line AB. Push another pin W into line EF some distance away from line AB. (d) Replace the block on the ray trace sheet. (e) View the images of pins W and X through the block. Place two pins Y and Z between your eye and the block so that Y, Z and the images of W and X appear exactly one behind the other. (f) Label the positions of pins W, X, Y and Z on the ray trace sheet. Remove the pins and the block. Using a rule, draw a line joining Z and Y and continue the line to meet the line CD at a point, which you should label G. (g) Draw a line to join the points F and G. (h) Measure and record the angle of refraction r between line FG and the normal NN'. N' N E F P Q E P D C X W N B N' A Q F Z G Y eye 6 0625/05/M/J/05 © UCLES 2005 © UCLES 2005

(i) Place the block on the second ray trace sheet so that one of its longest sides is along line PQ but with the largest face vertical (as shown in Fig. 4.2). Label the corners A, B, C and D. Fig. 4.2 (j) Repeat steps (b) – (h). (k) Place the block on the third ray trace sheet with the largest face down so that one of its shorter sides is along the line PQ. One corner should be about 1 cm to the left of point F, as shown in Fig. 4.3. Label the corners A, B, C and D. Fig. 4.3 (l) Repeat steps (b) – (h). (m) Within the limits of experimental error, what do you conclude about the effect on the angle of refraction r of increasing the length of the ray within the block? Tie your ray trace sheets into your Answer Booklet. N' N E F P Q N' N E F P Q 7 0625/05/M/J/05 © UCLES 2005

8 0625/05/M/J/05 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

This document consists of 7 printed pages and 1 blank page. SPA MML 8430 4/04 S81480/4 © UCLES 2005 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/05 Paper 5 Practical Test May/June 2005 1 hour 15 minutes ANSWER BOOKLET READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen in the spaces provided on this Answer Booklet. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. All of your answers should be written in this Answer Booklet: scrap paper must not be used. Answer all questions. Graph paper is provided in this Answer Booklet. Additional sheets of graph paper should be used only if it is necessary to do so. At the end of the examination, fasten any additional answer paper used securely to this Answer Booklet. Centre Number Candidate Number Name If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. For Examiner’s Use 3 2 1 4 Total

1 (a) (i) Record of temperature of the cold water … [1] (ii) – (v) [3] (vi) [5] 100 120 80 60 40 20 0 V / cm3 2 0625/05/AB/M/J/05 For Examiner’s Use © UCLES 2005
/ V / 0

(b) A practical reason why the student’s experimental line differed from the theoretical line … … … [1] 3 0625/05/AB/M/J/05 [Turn over For Examiner’s Use © UCLES 2005

2 (a) – (f) [8] (g) Working Predicted resistance … [2] 4 0625/05/AB/M/J/05 For Examiner’s Use © UCLES 2005 voltmeter connected across l / I / V / R / AB AC AD

3 (a) – (f) [6] (g) Statement … Reason … … … [2] (h) Description … … … [2] 5 0625/05/AB/M/J/05 [Turn over For Examiner’s Use © UCLES 2005 m/ g t1/ s t2/ s t / s T / s T ––/ m 400 300 200

Tie your ray trace sheets in here. [5] 6 0625/05/AB/M/J/05 For Examiner’s Use © UCLES 2005

4 (h) value of r … (j) value of r … (l) value of r … [4] (m) Within the limits of experimental error, … … … [1] 7 0625/05/AB/M/J/05 For Examiner’s Use © UCLES 2005

BLANK PAGE 8 0625/05/AB/M/J/05 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the June 2005 question paper 0625 PHYSICS 0625/05 Paper 5 (Practical Test), maximum mark 40 This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which Examiners were initially instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. Any substantial changes to the mark scheme that arose from these discussions will be recorded in the published Report on the Examination. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the Report on the Examination. • CIE will not enter into discussion or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the June 2005 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Grade thresholds for Syllabus 0625 (Physics) in the June 2005 examination. minimum mark required for grade: maximum mark available A C E F Component 5 40 33 26 20 15 The threshold (minimum mark) for B is set halfway between those for Grades A and C. The threshold (minimum mark) for D is set halfway between those for Grades C and E. The threshold (minimum mark) for G is set as many marks below the F threshold as the E threshold is above it. Grade A* does not exist at the level of an individual component.

June 2005 IGCSE MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0625/05 PHYSICS Practical Test

Page 1 Mark Scheme Syllabus Paper IGCSE - June 2005 0625 5 © University of Cambridge International Examinations 2005 1 (a) (i) record of room temp (sensible value) [1] (ii) - (v) θ in oC, V in cm3 [1] 6 sets of readings with correct V 0, 20, 40, 60, 80, 100 [1] Temps decreasing [1] (vi) y axis labelled [1] y axis suitable (e.g. not ‘3’ scale) and plots occupy more than ½ grid [1] all plots correct (-1 each error) (better than ½ sq) [2] well judged best fit line [1] (b) a sensible comment about heat loss to the surroundings [1] [Total: 10] 2 (a) - (f) l values 50, 75, 100 [1] I in A, V in V, R in Ω, l in cm or m [1] all I to 1 dp or better [1] all V to 1 dp or better [1] all R values correct [1] consistent 2 or 3 sf for R [1] AC R value 2 x AB = AD (+ 1Ω) [1] AD R value 2 x AC = AB + AD (+ 1Ω) [1] (g) > AD [1] 2 x AC (+ 1Ω) [1] [Total: 10] 3 (a) - (e) 3 complete sets [1] average correct [1] correct T values from average t [1] correct T/m values [1] consistent 2 or 3 sf for T/m [1] T/m in s/g [1] (f) No [1] T/m not constant [1] (g) time 10 oscillations [1] then divide by 10 [1] or two t values divide by 2 [Total: 10]

Page 2 Mark Scheme Syllabus Paper IGCSE - June 2005 0625 5 © University of Cambridge International Examinations 2005 4 (a) - (l) Traces 3 traces, blocks correct positions [1] neat lines all present [1] all r less than I and correct side of normal [1] all emergent rays in approx correct positions (i.e. opposite side of normal to incident ray and approx parallel to incident ray) [1] For Block Position 1: WX distance at least 5 cm and W on EF [1] YZ distance at least 5 cm [1] (i) - (n) first r value within + 2o of trace [1] three r values equal to each other + 2o [1] all r values 18o - 22o [1] (m) r is constant/no effect [1] [Total: 10]